Adds some code to help isolate where crash is happening

mojo/services/network/url_loader_impl.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "mojo/services/network/url_loader_impl.h"
 
 #include "base/memory/scoped_vector.h"
 #include "base/message_loop/message_loop.h"
 #include "mojo/common/common_type_converters.h"
 #include "mojo/common/url_type_converters.h"
@@ skipping 118 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(UploadDataPipeElementReader);
 };
 
 }  // namespace
 
 URLLoaderImpl::URLLoaderImpl(NetworkContext* context,
                              InterfaceRequest<URLLoader> request,
                              scoped_ptr<mojo::AppRefCount> app_refcount)
     : context_(context),
+      handle_watcher_(12),
       response_body_buffer_size_(0),
       auto_follow_redirects_(true),
       connected_(true),
       binding_(this, request.Pass()),
       app_refcount_(app_refcount.Pass()),
       weak_ptr_factory_(this) {
   binding_.set_connection_error_handler([this]() { OnConnectionError(); });
   context_->RegisterURLLoader(this);
 }
 
@@ skipping 254 matching lines @@
 
 void URLLoaderImpl::ListenForPeerClosed() {
   handle_watcher_.Start(response_body_stream_.get(),
                         MOJO_HANDLE_SIGNAL_PEER_CLOSED,
                         MOJO_DEADLINE_INDEFINITE,
                         base::Bind(&URLLoaderImpl::OnResponseBodyStreamClosed,
                                    base::Unretained(this)));
 }
 
 }  // namespace mojo